Partial discharge meter for overhead lines and cable accessories, with wireless remote reading.
The APD-LT is a portable partial discharge meter designed to inspect in-service cable and overhead-line accessories, such as cable heads, line arrestors, insulators and bushings. The capacitive sensor is applied from the ground or with an insulated hotstick, with no need for direct contact with the conductor, and transmits the reading wirelessly to a remote display that shows the discharge level in real time.
Advantages
Contactless measurement without interrupting service
The APD-LT's capacitive sensor is applied to the line accessory with no need for direct contact with the conductor or for disconnecting the installation, allowing energised equipment to be inspected with maximum safety for the operator.
Compact, lightweight and hotstick-ready
The measurement module attaches to any standard insulated hotstick through a universal end fitting, and its reduced weight makes it easy to handle during extended overhead-line inspections.
Wireless reading at a distance
The reading is transmitted by radio frequency to an independent remote display, so the operator can move away from the measuring point and check the discharge level without approaching the energised accessory.
Long autonomy and immediate start-up
The measurement module runs on a standard 9V alkaline battery, offers up to ten hours of continuous use, and switches off automatically after a period of inactivity to extend battery life.
Applications
- Partial discharge detection in cable heads.
- Partial discharge detection in line arrestors.
- Partial discharge detection in insulators.
- Partial discharge detection in bushings.
About the product
The unit consists of a measurement module with a highly sensitive capacitive sensor, adjustable to match the geometry of the accessory being inspected, and an independent remote display that receives the reading by radio frequency. The display indicates the discharge level in decibels and separately shows the battery status and signal-overload detection.
The measurement module includes a universal end fitting compatible with the insulated hotsticks commonly used in the industry, allowing the check to be carried out from the ground or from an aerial bucket without climbing the structure. The complete set is carried in a semi-rigid case that protects both units and their accessories while moving between sites.
Available accessories: wireless remote display, universal hotstick end fitting, adjustable capacitive sensor and semi-rigid carrying case.
Technical specifications
| Dynamic range | 60 dB |
| Accuracy | ± 2 dB (direct contact injection) |
| Bandwidth | 30 MHz to 47 MHz |
| Wireless communication | Bluetooth Low Energy (BLE), up to 30 m typical range |
| Measurement module power supply | 1 9V alkaline battery; up to 10 hours of continuous use |
| Protection rating | IP66 (measurement module) / IP68 (remote display) |
| Measurement module weight and dimensions | 0.43 kg; 192.5 x 120.7 x 47.4 mm |
| Approval | CE directive |
Frequently asked questions
Is contact with the conductor needed to measure?
No. The measurement module's capacitive sensor is applied to the accessory's surface with no direct contact with the conductor, from the ground or with an insulated hotstick.
How is the reading received?
Wirelessly, on an independent remote display that shows the discharge level in decibels together with battery status and overload detection.
What autonomy does the unit offer?
The measurement module runs on a 9V alkaline battery and offers up to ten hours of continuous use, with a configurable automatic shut-off after a period of inactivity.
Is it compatible with any hotstick?
Yes, the measurement module includes a universal end fitting compatible with the standard insulated hotsticks used in the industry.
Which accessories can it be used on?
Cable heads, line arrestors, insulators and bushings, in both outdoor and indoor installations.
